Combine libraries: spl, avl, efi, share, unicode.

These libraries, which are an artifact of the ZoL development
process, conflict with packages that are already in distribution:

  * libspl: SPL Programming Language
  * libavl: AVL for Linux
  * libefi: GRUB

And these libraries are potential conflicts:

  * libshare: the Linux Mount Manager
  * libunicode: Perl and Python

Recompose these five ZoL components into the four libraries that are
conventionally provided by Solaris and FreeBSD systems:

  + libnvpair
  + libuutil
  + libzpool
  + libzfs

This change resolves the name conflict, makes ZoL more compatible
with existing software that uses autotools to detect ZFS, and allows
pkg-zfs to better reflect the official Debian kFreeBSD packaging.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes: #430

lib/libunicode/Makefile.am

@@ -6,10 +6,8 @@ DEFAULT_INCLUDES += \
 	-I$(top_srcdir)/include \
 	-I$(top_srcdir)/lib/libspl/include
 
-lib_LTLIBRARIES = libunicode.la
+noinst_LTLIBRARIES = libunicode.la
 
 libunicode_la_SOURCES = \
 	$(top_srcdir)/module/unicode/u8_textprep.c \
 	$(top_srcdir)/module/unicode/uconv.c
-
-libunicode_la_LDFLAGS = -version-info 1:0:0